摘要
采用传统陶瓷制备工艺制备了Bi0．5（Na0．82-xK0.18Lix）0.5TiO3（x=0.01-0.07）无铅压电陶瓷。研究了该体系陶瓷的微结构以及应力对平面机电耦合系数‰和压电常数盔，的影响。结果表明，Bi0．5（Na0．82-xK0.18Lix）0.5TiO3无铅压电陶瓷具有单一钙钛矿结构，Li^＋有抑制晶粒长大的作用。当x=0．03时，压电陶瓷样品表现出优良的压电性能：压电常数幽和平面机电耦合系数岛分别为154pC／N和0．296。同时发现，退火可消除内应力，有利于提高d33，但会使拓减小；极化会引起介电常数岛减小，电畴转向过程中产生的应力对如影响较为明显。
The lead-free piezoelectric ceramic [Bi0.5（Na0.82-xK0.18Lix）0.5]TiO3（x=0.01-0.07）was prepared by conventional ceramic sintering technique. The influence of microstructure and stress on piezoelec-tric properties of the ceramic was investigated. Results show that the lead-free piezoelectric ceram-ic Bi0.5（Na0.82-xK0.18Lix）0.5TiO3 has a pure perovskite structure and Li＋ inhibits the growth of grain. The piezoelectric ceramic samples show good piezoelectric properties when x=0.03： piezoelectric constant d33 and electromechanical coupling coefficient kp is 154pC/N and 0.296 respectively. Further- more, it is found that annealing could eliminate stress and help to improve the piezoelectric con-stant d33, but decrease the electromechanical coupling coefficient kp. Polarization will cause dielec-tric constant εr to decreas and the stress caused by the reorientation of the domain has a obvious influence on d33.
出处
《电工材料》
CAS
2012年第2期46-50,共5页
Electrical Engineering Materials
基金
2009年国家级大学生创新性实验项目(ZCC0123)
广西教育厅重点项目(201012MS083)
广西自然科学基金(2010GXNSFB013010)
关键词
压电性能
压电常数
机电耦合系数
应力
电畴
piezoelectric properties
piezoelectric constant
electromechanical coupling coefficient
stress
domain
